I despise it. At this point, I don't care if my email doesn't get seen. I'll tell people to whitelist my domain if they care to see my emails. For really really urgent stuff I'll maybe use a throwaway Gmail account on the off chance.

Thanks!

In my experience running a small hosting provider (we had a client that sent every month a newsletter to a few tens of thousands of addresses), gmail was not the problem, fucking outlook.com and hotmail and other Microsoft domains were.